GitLab CEO here. Awesome to see this article! Ask me anything.
a) I know some projects which would love to move to gitlab from sourceforge, but you don't provide mailing lists like the latter, right?
b) Why is your git-blame feature so fragile? It barely works for me, almost always shows the "error" page.
c) Since you shut down gitorious you have published a mirror to get the data out (thanks! finally!), but I don't find one repository in your list in here :( : https://gitorious.org/index-list.html it was called banshee-community-extensions/windows-binaries.git or something like that.